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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f93ed1f1db8c1f7011b72ba5a195fcf3a2310e17e2248cef6767b269428e005' 
  AND token = 'X9CC+2y4JfMh4Z/lk4WkV2wkWCUSe8jBl2U8VLL9UgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}